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authorClaudio Imbrenda <imbrenda@linux.vnet.ibm.com>2018-04-30 19:33:25 +0300
committerChristian Borntraeger <borntraeger@de.ibm.com>2018-07-13 10:48:57 +0300
commitafdad61615cc37fef91bc70af7ee5b293785fbd6 (patch)
tree7ff6e123b9b925f7d7a53b66d201dcd5a383e58c /arch/s390/kvm/priv.c
parent03133347b4452ef9b1f1456b92f5fafa467c0655 (diff)
downloadlinux-afdad61615cc37fef91bc70af7ee5b293785fbd6.tar.xz
KVM: s390: Fix storage attributes migration with memory slots
This is a fix for several issues that were found in the original code for storage attributes migration. Now no bitmap is allocated to keep track of dirty storage attributes; the extra bits of the per-memslot bitmap that are always present anyway are now used for this purpose. The code has also been refactored a little to improve readability. Fixes: 190df4a212a ("KVM: s390: CMMA tracking, ESSA emulation, migration mode") Fixes: 4036e3874a1 ("KVM: s390: ioctls to get and set guest storage attributes") Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com> Message-Id: <1525106005-13931-3-git-send-email-imbrenda@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/priv.c')
-rw-r--r--arch/s390/kvm/priv.c28
1 files changed, 19 insertions, 9 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index c4da375553e8..c623b6f1dd4e 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -987,9 +987,11 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
return 0;
}
-static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
+/*
+ * Must be called with relevant read locks held (kvm->mm->mmap_sem, kvm->srcu)
+ */
+static inline int __do_essa(struct kvm_vcpu *vcpu, const int orc)
{
- struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state;
int r1, r2, nappended, entries;
unsigned long gfn, hva, res, pgstev, ptev;
unsigned long *cbrlo;
@@ -1039,10 +1041,12 @@ static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
cbrlo[entries] = gfn << PAGE_SHIFT;
}
- if (orc && gfn < ms->bitmap_size) {
- /* increment only if we are really flipping the bit to 1 */
- if (!test_and_set_bit(gfn, ms->pgste_bitmap))
- atomic64_inc(&ms->dirty_pages);
+ if (orc) {
+ struct kvm_memory_slot *ms = gfn_to_memslot(vcpu->kvm, gfn);
+
+ /* Increment only if we are really flipping the bit */
+ if (ms && !test_and_set_bit(gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms)))
+ atomic64_inc(&vcpu->kvm->arch.cmma_dirty_pages);
}
return nappended;
@@ -1071,7 +1075,7 @@ static int handle_essa(struct kvm_vcpu *vcpu)
: ESSA_SET_STABLE_IF_RESIDENT))
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
- if (likely(!vcpu->kvm->arch.migration_state)) {
+ if (!vcpu->kvm->arch.migration_mode) {
/*
* CMMA is enabled in the KVM settings, but is disabled in
* the SIE block and in the mm_context, and we are not doing
@@ -1099,10 +1103,16 @@ static int handle_essa(struct kvm_vcpu *vcpu)
/* Retry the ESSA instruction */
kvm_s390_retry_instr(vcpu);
} else {
- /* Account for the possible extra cbrl entry */
- i = do_essa(vcpu, orc);
+ int srcu_idx;
+
+ down_read(&vcpu->kvm->mm->mmap_sem);
+ srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
+ i = __do_essa(vcpu, orc);
+ srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
+ up_read(&vcpu->kvm->mm->mmap_sem);
if (i < 0)
return i;
+ /* Account for the possible extra cbrl entry */
entries += i;
}
vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */